I read prolifically as a teenager (surprise!).
I spent most afternoons in the school library (not least because it was a warm and dry place to wait for the school bus), and the librarian would often recommend titles to me.
But I didn’t track what I read back then, so don’t remember a lot of what I read.
A lot of the books I read were library books, so I didn’t get the opportunity to re-read them.
One series I read and re-read was the Trebizon series by Anne Digby, which were set in a girls’ boarding school in England but which were new books so were contemporary to my era (unlike the Mallory towers books by Enid Blyton, which were written and set in the 1950s).
I’d always been fascinated by Enid Blyton’s English boarding school stories, and thoroughly enjoyed reading about Rebecca, Tish, and Sue and their adventures in Cornwall.